There, it will absorb almost all ultraviolet light which is harmful to many organisms. This is true even in antarctica, where the largest seasonal ozone losses, the socalled antarctic ozone. B dobson inferred correctly that the cause of the warm stratosphere was heating by the absorption of ultraviolet solar radiation by ozone, and he set out to. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Policy responses to ozone depletion mario molina and sherwood rowland showed in 1974 that cfc gases destroy ozone coordinating committee on ozone layer ccol established by unep in the 1970s vienna convention for the protection of the ozone layer held in 1985 montreal protocol to ban. Atmospheric lifetimes and ozone depletion potentials of trans1chloro3,3,3tri. The depletion of total ozone due to chlorofluoromethanes was calculated in a twodimensional, timedependent model. Ppt effects of ozone depletion powerpoint presentation. A free powerpoint ppt presentation displayed as a flash slide show on id.
Our powerpoint presentation about ozone depletion, its effects and its causes. Ozone and environment ozone o3 a gas composed of three atoms of oxygen bluish gas that is harmful to breathe nearly 90% of the earths ozone is in the stratosphere and is referred to as the ozone layer ozone absorbs a band of ultraviolet radiation called uvb ozone depleting substances ods. Cfc 11, or r11 has the maximum potential amongst chlorocarbons because of. Ozone layer depletion, its causes and its effects free download as powerpoint presentation. Um dir eine tolle qualitat zu bieten, hat sich smallpdf mit solid documents zusammengeschlossen. Cfcs nonflammable nontoxic trap heat good insulators. British atlantic survey research station, holly bay, antarctic coast. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. Ozone depletion simple english wikipedia, the free.
Celebrating prezi s teacher community for teacher appreciation week. Shows the suffix tion and teaches the rule to apply when adding the s. Presentation on ozone depletion slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Jacc report 53 cyanides of hydrogen, sodium and potassium, and acetone cyanohydrin vol.
Odp is defined as the integrated change in total ozone per unit mass. Temperature of the stratosphere is a key factor, as is sunlight, in the depletion of ozone. Ozone depletion potentials odps were a very important measure in the formulation of the montreal protocol and its amendments. Pdf in ppt, pdf in powerpoint umwandeln adobe document cloud. Physics of semiconductor devices pn junction depletion width. Ozone layer depletion cause, effects, and solutions. Greenhouse gases and ozone hole temperature and ozone take home points continued anthropogenic release of greenhouse gases, not only cfcs, into the atmosphere will enlarge the ozone holes, letting more harmful uv rays reach the earths surface. Ozone depletion free download as powerpoint presentation. Ozone and the ozone hole background catalyst to breaking up the ozone layer. Ozone layer depletion, its causes and its effects scribd. We document that the times and locations of major global warming observed over the past 60 years are contemporaneous with and colocated with the times and locations of greatest ozone depletion caused both by human activities 3% and by volcanic eruptions 6% each, even small basaltic extrusive eruptions. Chapter 14 depletion of resource what depletion of resources is. Ozone absorbs a band of ultraviolet radiation called uvb.
It is called a large amount of ozone to the molecules that are accumulate in the atmosphere and together act as a shield for some sunlight. Although natural phenomenon can cause ozone depletion but human activities such as cfcs are now accepted as major cause of depletion 9. B dobson and other scientists in measuring concentrations of chloride and ozone in the atmosphere g. If the value of v gs is positive, the channel is further enhanced. In 1985, using satellites, balloons, and surface stations, a team of researchers had discovered a balding patch of ozone in the upper stratosphere, the size of the united states, over antarctica. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. What are the depletion width in the nregion, the depletion width in the pregion, and the builtin potential at 300k. From the 10 km to about 50 km, is known by the name of stratospheric layer.
Luis favelaas we have seen, the atmosphere is divided into several layers. Formation and depletion effect of the montreal protocol on stratospheric cl sunlight incident on earth is very roughly. Presentation on ozone depletion ozone depletion medicine. Ozone depletion facts and information national geographic. Cfc 11, or r11 has the maximum potential amongst chlorocarbons because of the presence of three chlorine atoms in the molecule. Title vi for stratospheric ozone protection, signed into law. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone layer, of about 4%, per decade. The first one has been a slow, but steady ozone depletion of 4% per decade of the earths. How to convert powerpoint to pdf, convert to pdf, ppt to pdf. The genesis of scientific assessment of ozone depletion.
Physics of semiconductor devices pn junction depletion width problem a silicon pn diode has a doping of n d 81015 1 cm3 and n a 210 16 1 cm3. The atmosphere is mostly transparent to the visible except for scatter. Are home performance contractors or home inspectors better suited to deliver the profile. Powerpoint is the worlds most popular presentation software which can let you create professional depletion of ozone layer powerpoint presentation easily and in no time. The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson. Thus the environmental limits to economic growth manifest themselves as either. Wuebbles department of atmospheric sciences, university of illinois, urbana, illinois usa received. Why the hole in the atmospheric ozone layer above us. Environmentalists have made numerous apocalyptic predictions over the past. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. The thinning of the ozone layer has increased the risk that australians already face from overexposure to uv radiation from an outdoor lifestyle. This helps you give your presentation on depletion of ozone layer in a conference, a school lecture, a business proposal, in a webinar and business and professional representations. Causes of ozone layer depletion and its effects on human.
Presentation on ozone depletion free download as powerpoint presentation. Explain the formation of potential barrier and depletion layer. The potential difference required to move the electrons through the electric field is called the barrier potential. These processes are all intimately connected through chemical, radiative, and dynamical feedbacks.
Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Protecting the ozone layer department of the environment. Presentation on ozone depletion linkedin slideshare. This helps you give your presentation on depletion of ozone layer in a conference, a school lecture, a business proposal, in a webinar and business and professional representati. The thinning of the ozone layer has increased the risk that australians already face from overexposure to. Layer which protects people from ultraviolet destroy of. Further, no ecosystem or species was ever shown to be seriously harmed by ozone depletion.
Effects of ozone depletion 1 effects of ozone depletion 2 the discovery. If you continue browsing the site, you agree to the use of cookies on this website. To prevent decrease the occurrence of needle stick injuries among staff and others. Ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth. Unlike oxygen o2, ozone has a strong scent and is blue in color.
Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Ozone is a gas that is present in the ozone layer in the stratosphere of the earth. Are buyers willing to pay for the profile as an energy inspection addon to the home inspection. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone. The ozone depletion potential odp of a chemical compound is the relative amount of degradation to the ozone layer it can cause, with trichlorofluoromethane r11 or cfc11 being fixed at an odp of 1. Policy responses to ozone depletion mario molina and sherwood rowland showed in 1974 that cfc gases destroy ozone coordinating committee on ozone layer ccol established by unep in the 1970s vienna convention for the protection of the ozone layer held in 1985 montreal protocol to ban substances that. Chlorodifluoromethane r22, for example, has an odp of 0. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. This timeline highlights the average area of the ozone hole between september 7th and october th as observed by nasa spacedbased instruments see colored bars and scale. Ozone and environment ozone o3 a gas composed of three atoms of oxygen bluish gas that is harmful to breathe nearly 90% of the earths ozone is in the stratosphere and is referred to as the ozone layer ozone absorbs a band of ultraviolet radiation called uvb ozonedepleting substances ods. Fred magdoff environmentalists and scientists often refer to the two different ends of the environmental problem as sources and sinks. It contains some videos and gif at thte end from an external source. Ozone depletion over india with so much worry about the rapid ozone depletion taking place in various parts of the earth, indian scientists are closely monitoring the ozone layer over india for possible depletion trends. It is very essential as it prevents nearly 99% o f the uv.
Objectives of the seminar to improve the knowledge of the university community including students, hospital staff and general public on injection safety and management of hospital waste. The ozone layer is mainly found in the lower portion of the stratosphere. As a result, there has been a general thinning of the ozone layer over most of the globe, including between five to nine per cent depletion over australia since the 1960s. The conduction channel is physically implanted rather than induced. The computed reductions show a significant variation with latitude and season.
The main causes responsible for the depletion of the ozone layer are listed below. There is shortage of drinking water and water for irrigation. Ozone depletion ozone depletion chlorofluorocarbon free. Scribd is the worlds largest social reading and publishing site. Chlorofluorocarbons or the cfc are the main cause of ozone layer depletion. This is apparently found in the lowest region of the stratosphere. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. Depletion of ozone layer by marino nishihara on prezi. One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in the amounts of ultraviolet radiation received at the surface of. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9.
It contains high concentrations of ozone o3 relative to other parts of the atmosphere. Ozone depletion ozone depletion chlorofluorocarbon. The international treaty to protect the ozone layer turns 20 this year. Powerpoint prasentation exportieren pdf slidepress. Physics of semiconductor devices pn junction depletion. Odp values are used to provide a simple way to compare the relative ability of various ods to destroy stratospheric ozone. The depletion mosfet the physical construction of a depletion mosfet is identical to the enhancement mosfet, with one exception. Cfcs, hcfcs, halons, methyl bromide, carbon tetrachloride, and methyl chloroform. There, between 15 and 30 km, is where what is known as ozone. Case study depletion of ozone in the atmosphere the work of g. Relative value that indicates the potential of a substance to destroy ozone gas as compared with the potential of chlorofluorocarbon11 cfc11 which is assigned a reference value of 1. The term junction refers to the boundary interface where the two regions of the semiconductor meet. It shields the entire earth frommuch of the harmful uv radiationthat comes from the sun 3.
Causes of ozone depletion there are two different types of ozone depletion, both are very similar. The chlorofluorocarbon and the halons are potent ozone depletors. Within the stratosphere, the ozone layer is the portion that contains the highest proportion of. Ozone layer is also naturally broken down but there is a balance between its formation and natu. Ozone layer is a thin, fragileshield that contains relatively highconcentrations of ozone. Helvetica neue light arial avenir helvetica neue times new roman office theme office theme 5. The electric field formed in the depletion region acts as a barrier. Inexpensive light extremely stable, inert traditional refrigerants ammonia, sulfur dioxide, methyl chloride highly volatile caustic and toxic remove heat through vaporization of liquefied gas only adequate as refrigerants expensive heavy transport, storage. The ozone layer forms a most important part of the earths stratosphere as it can absorb most of the uv radiation and prevent it from reaching the surface of the earth. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Safeguarding earths protective ozone layer became a. Is there market demand for the profile, or are incentives, subsidies, or mandates needed to drive demand. Jan 20, 2010 causes of ozone depletion there are two different types of ozone depletion, both are very similar. The ozone layer helps to protect life from harmful ultraviolet radiation.
Ppt ozone layer depletion powerpoint presentation free. External energy must be applied to get the electrons to move across the barrier of the electric field. The ozone layer depletion is a major concern and is associated with a number of factors. Almost all physical, chemical, biological and other activities are responsible for environmental degradation. Ozone depletion simple english wikipedia, the free encyclopedia. There is widespread concern that the ozone layer is deteriorating due to the release of pollution containing the chemicals chlorine and bromine. A quick powerpoint to recap on prefixes and suffixes changing the meaning of words. Atmospheric lifetimes and ozone depletion potentials of. Thus, for a depletion nmos transistor, the channel conducts even if v gs0. The term ozone depletion can refer to a number of distinct, but related phenomena. Ozone depletion potential odp the odp of a compound is defined as the ratio of the total amount of ozone destroyed by that compound to the amount of the ozone destroyed by the same mass of cfc11. In this infographic, learn how to convert powerpoint to acrobat and back again, also called round trip speaker notes.
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